Plum Branch, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.2 °F (low) to 74.6 °F (high). Annual precipitation averages 46.3 Inches. Plum Branch is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.2 °F | 55.4 °F | 4.06 in. |
| February | 35.2 °F | 58.8 °F | 3.87 in. |
| March | 41.4 °F | 66.8 °F | 4.51 in. |
| April | 49.5 °F | 75.2 °F | 3.17 in. |
| May | 58.3 °F | 82.5 °F | 3.24 in. |
| June | 66.4 °F | 88.7 °F | 4.58 in. |
| July | 69.9 °F | 91.9 °F | 4.1 in. |
| August | 69.0 °F | 90.6 °F | 4.35 in. |
| September | 63.2 °F | 85.5 °F | 3.67 in. |
| October | 51.6 °F | 76.2 °F | 3.0 in. |
| November | 40.6 °F | 65.6 °F | 3.46 in. |
| December | 35.7 °F | 57.5 °F | 4.26 in. |
| Annual | 51.2 °F | 74.6 °F | 46.27 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |